Impact-modified polyamide compositions
View Patent ↗Described herein are polyamide compositions and processes for producing polyamide compositions, comprising: (i) a polyamide, (ii) an olefin-maleic anhydride copolymer (on its own or in a master batch form), and (iii) an impact modifier (or an elastomeric polymer with an optional compatibilizer), which exhibit enhanced ambient and low temperature impact strength complimented by excellent thermal, tensile and flexural properties.
1. A polyamide formulation comprising
a polyamide,
a 1:1 alternating olefin-maleic anhydride copolymer, wherein the olefin is ethylene, and
an impact modifier,
wherein the impact modifier is an acrylic-core shell impact modifier, a polymer or copolymer with maleic anhydride or isocyanate pendant groups, an ethylene-acrylate ester-maleic anhydride terpolymer, an ethylene-acrylate ester copolymer, a thermoplastic olefin, or a thermoplastic elastomer, and
wherein the olefin-maleic anhydride copolymer increases the heat deflection temperature (HDT) by an amount in the range of 4.5° C. to 26.4° C. as measured by ASTM D648 at 66 psi.
2. The polyamide formulation of claim 1 , wherein the formulation does not include glass fibers.
3. The polyamide formulation of claim 1 , wherein the acrylate ester is a methyl, propyl, or butyl acrylate ester.
4. The polyamide composition of claim 1 , wherein the polyamide is selected from the group consisting of nylon-6, nylon 6-6, a copolymer of nylon-6 and nylon 6-6, nylon-9, nylon-10, nylon-11, nylon-12, nylon 6-10, aromatic polyamides, elastomeric polyamides, and mixtures thereof.
5. The polyamide composition of claim 1 , wherein the polyamide is selected from the group consisting of nylon-6, nylon 6-6, a copolymer of nylon-6 and nylon 6 6, and mixtures thereof.
6. The polyamide composition of claim 1 , wherein the olefin-maleic anhydride copolymer has a weight average molecular weight of about 20,000 to about 800,000.
7. The polyamide composition of claim 1 , wherein the impact modifier is a grafted-maleic anhydride elastomer or a grafted-maleic anhydride terpolymer having a maleic anhydride content of from about 0.5% to about 5%.
8. An article comprising a polyamide composition according to claim 1 .
9. The polyamide composition of claim 1 , wherein the olefin-maleic anhydride copolymer increases the Izod Impact Strength by an amount in the range of 0.39 ft-lb/in to 2.1 ft-lb/in at 23° C. as measured by ASTM D256.
10. The polyamide composition of claim 1 , wherein the Izod Impact Strength is 1.21 ft-lb/in to 2.93 ft-lb/in at 23° C. as measured by ASTM D256.
11. The polyamide composition of claim 1 , wherein the olefin-maleic anhydride copolymer increases the Flexural Modulus by an amount in the range of 72 MPA to 510.5 MPA as measured by ASTM D790.
12. The polyamide composition of claim 1 , wherein Flexural Modulus is 1498 MPA to 1913.3 MPa as measured by ASTM D 790.
13. A polyamide composition produced by a process comprising the steps of:
(a) preparing a master batch composition comprising an impact modifier and a 1:1 alternating olefin-maleic anhydride copolymer, wherein the olefin is ethylene; and
(b) compounding a polyamide with the master batch composition,
wherein the impact modifier is an acrylic-core shell impact modifier, a polymer or copolymer with maleic anhydride or isocyanate pendant groups, an ethylene-acrylate ester-maleic anhydride terpolymer, an ethylene-acrylate ester copolymer, a thermoplastic olefin, or a thermoplastic elastomer, and
wherein the olefin-maleic anhydride copolymer increases the heat deflection temperature (HDT) by an amount in the range of 4.5° C. to 26.4° C. as measured by ASTM D648 at 66 psi.
14. The polyamide composition of claim 13 , wherein the composition does not include glass fiber.
15. The polyamide composition of claim 13 , wherein the master batch further comprises one or more stabilizing agents.
16. The polyamide composition of claim 15 , wherein the one or more stabilizing agents is selected from the group consisting of cuprous iodide, potassium iodide, tris (2,4-di-tert-butylphenyl)phosphite, and N,N′-hexane-1,6-diylbis(3-(3,5-di-tert-butyl-4-hydroxyphenylpropionamide)).
17. The polyamide composition of claim 13 , wherein the master batch further comprises one or more compatibilizers selected from the group consisting of acrylic acid modified polypropylene homopolymer, maleic anhydride modified polypropylene homopolymer, ethylene acrylic acid copolymer, and ethylene-octene copolymer grafted with maleic anhydride.
18. A polyamide composition produced by a process comprising the steps of:
(a) preparing a master batch composition comprising an impact modifier and a 1:1 alternating olefin-maleic anhydride copolymer, wherein the olefin is selected from the group consisting of ethylene, propylene, isobutylene, 1-butene, 1-octene, butadiene, isoprene, 1-hexene, 1-dodecene, and 1-tetradecene; and
(b) compounding a polyamide with the master batch composition,
wherein the impact modifier is an acrylic-core shell impact modifier, a polymer or copolymer with maleic anhydride or isocyanate pendant groups, an ethylene-acrylate ester-maleic anhydride terpolymer, an ethylene-acrylate ester copolymer, a thermoplastic olefin, or a thermoplastic elastomer, wherein the master batch further comprises one or more compatibilizers selected from the group consisting of acrylic acid modified polypropylene homopolymer, maleic anhydride modified polypropylene homopolymer, ethylene acrylic acid copolymer, and ethylene-octene copolymer grafted with maleic anhydride.
19. The polyamide composition of claim 18 , wherein the composition does not include glass fiber.
20. The polyamide composition of claim 18 , wherein the polyamide is selected from the group consisting of nylon-6, nylon 6-6, a copolymer of nylon-6 and nylon 6-6, nylon-9, nylon-10, nylon-11, nylon-12, nylon 6-10, aromatic polyamides, elastomeric polyamides, and mixtures thereof.